I booked a Superior room with a balcony, and from what I was told by the staff via email correspondence was that they cannot guarantee the balcony but will list is as something I requested, and traditionally, persons who book directly through them/their website will receive priority consideration. This policy is a little ambiguous, and caused me to email them multiple times about it, especially as it got closer to my stay as I booked it well in advance and really wanted it. I think what it comes down to is depending on what rooms are occupied when you get there, there's no way to say for sure if you will get a room with a balcony. Let's say you and someone else's reservations overlap, and you both want a balcony, but they check in first—it's going to be first come first serve and they will get it.

Dear Susanjohn58 Thank you again for this message. The Hallenstadion is about 20 minutes by car away and the cost for a Taxi is about CHF 50.00 per ride. We hope those information help you. Kind regards The Hotel Opera-Team